CN1721704A - Fan Speed Control Using Micro-Processing Unit - Google Patents

Abstract

The invention discloses a fan rotating speed control device using a microprocessor unit, which is arranged in a fan motor, and is characterized in that the fan rotating speed control device is characterized by comprising a programmable microprocessor unit, a rotating speed judging rule and a rotating speed judging rule, wherein the programmable microprocessor unit is used for receiving an input signal of the fan rotating speed control device and a rotating speed signal obtained by detecting the actual rotating speed of a fan, determining an output signal according to the input signal and the rotating speed signal through the rotating speed judging rule and transmitting the output signal to the fan, and adjusting the rotating speed of the fan to drive the fan. Wherein the rotational speed has a multi-step functional relationship with the input signal.

Description

Fan Speed Control Using Micro-Processing Unit

technical field

The present invention relates to a fan speed control device, and more particularly to a fan speed control device using a microcontroller to control a fan motor.

Background technique

Generally speaking, the known fan control system can be controlled by using a complex circuit composed of various circuit components according to different functions required. For example, FIG. 1a, FIG. 1b, FIG. 1c, FIG. 2a and FIG. 2b show various conventional fan control systems with different functions. These known fan control systems are described below respectively.

First, known fan control systems can be used to control the speed of the fan. For example, FIG. 1a is a schematic diagram showing control by an external variable DC voltage signal in a known fan control system. The fan 500 in FIG. 1a receives an operating voltage Vcc, and uses a comparator 520 to generate a pulse width modulation (PulseWidth Modulation, PWM) signal. As shown in Figure 1a, the comparator 520 respectively receives an external variable 0-5V DC voltage signal input and a triangular wave signal input, and determines the generated PWM signal according to the value of the variable DC voltage compared with the triangular wave, through the switch 590 is output to the fan drive circuit 510 to determine the speed of the fan motor.

The same situation for controlling the fan speed can also be shown in FIG. 1 b , which represents the variable voltage signal control of the thermistor in the known fan control system. Similar to FIG. 1a, the fan 500 in FIG. 1b receives an operating voltage Vcc, and also uses a comparator 520 to generate a PWM signal. As shown in FIG. 1b, the comparator 520 respectively receives a triangular wave signal input and a variable voltage signal input generated by the operating voltage Vcc through a voltage division operation of a thermistor 530 and a fixed resistor 540, and according to the variable voltage The value is compared with the triangular wave to determine the generated PWM signal, which is output to the fan drive circuit 510 through the switch 590 to determine the speed of the fan motor.

In addition, when controlling the speed of the fan, the input signal may not be in the form of a voltage signal, but as shown in FIG. 1 c , an external PWM signal is input to control the fan 500 . In FIG. 1c, the fan 500 also receives an operating voltage Vcc; and the external PWM signal input is converted into an internal PWM signal through a circuit component, such as a resistor 542, and is output to the fan drive circuit 510 through a switch 590 to determine the fan motor. Rotating speed.

In addition to controlling the speed of the fan, known fan control systems can also achieve operations such as slow start (soft start), or special speed change and detection through methods such as fan motor rotor position control. For example, FIG. 2a is a schematic diagram showing a fan motor driven by a fan driving IC in a conventional fan control system. Wherein, the fan 500 also receives an operating voltage Vcc; at the same time, the coil 570 of the fan motor is controlled by a fan drive IC (fan drive circuit) 510, and cooperates with a magnetic field induction component, such as the Hall component 560 in FIG. 2a, and a capacitor 550, etc. Components to control the position of the fan motor rotor for slow start (soft start) or special speed change and detection operations. The same operation can also be performed by using the Hall element 560 in conjunction with resistors 544, 546 and other circuits to drive the coil 570 of the fan motor as shown in FIG. 2b.

However, the known fan control systems described above have a number of disadvantages. These issues are described separately below.

First of all, in the known fan control system, if you want to change the speed of the fan, if you do not use an external method, such as the above-mentioned external PWM signal, etc., that is to say, for a fixed input voltage, the only way is to change Coil winding of the fan motor. In other words, in a fixed fan motor coil winding, there is a relationship between the rotational speed and the operating voltage similar to that shown in Figure 3. For example, for the relationship function F between the rotational speed and the operating voltage in Figure 3, if there is an input The voltage Vo can correspond to the point A on the characteristic line of the relationship function F, and the corresponding first rotational speed value Wo can be obtained. Thus, for the same input voltage, if the fan is to have multiple stages of different speeds, it is necessary to design the same number of coil windings with different characteristics; this will adversely affect the size and production cost of the fan.

Secondly, as in the two known examples shown in Figure 1a and Figure 1b above, the triangular wave and the comparator 520 are used to generate pulse modulation signals, and in the way of controlling the fan speed, regardless of the 0-5V external DC used in Figure 1a The voltage input comparator 520, or the thermistor 530 used in Figure 1b to change the voltage input comparator 520, both use hardware circuit components, and the replaceability is not large, and the triangle wave and the PWM signal generated by it may produce a large error, resulting in the phenomenon of unstable speed.

In addition, in the known fan control system shown in Figure 1c, the internal PWM signal is obtained by converting the external PWM signal through circuit components, such as resistor 542, etc., because the internal PWM signal is limited by the external PWM signal. Frequency and power cycle, so when the frequency of the external PWM signal is low, the vibration will increase accordingly, which will affect the life of the fan 500; when the frequency of the external PWM signal is high, the circuit response speed may not be fast enough, resulting in unstable speed problem, and the frequency of the PWM signal may fall within the audio range of human hearing during the conversion process, resulting in motor switching noise.

In addition, in the known fan control system for controlling the position of the fan motor rotor as shown in Figure 2a and Figure 2b, no matter whether the fan driver IC 510 is used as shown in Figure 2a, or the Hall element 560 is used to cooperate with the circuit design as shown in Figure 2b , or even use other magnetic field induction components or methods, the circuit components are all hardware components, which are not very replaceable and also have the problem of fixed characteristics.

In addition, as shown in FIG. 3 , it is assumed that the fan motor itself has a relationship function F between the rotation speed and the operating voltage, and the relationship function F is a linear function. At this time, the maximum speed Wmax that the fan motor itself can withstand can correspond to point B on the F line, and a maximum voltage value Vmax can be obtained by inverse calculation; if the maximum voltage value exceeds this value, the speed will be too high, which will cause the fan motor Damaged due to overheating and other factors; therefore, the input voltage value is limited to below the maximum voltage value Vmax, for example, the common fan motor on the market can generally reach a maximum of 60V. However, the power supply provided by some fan systems may exceed the maximum voltage value. At this time, the input voltage must be controlled below point B by means of voltage cutoff to avoid damage to the fan motor. This approach not only increases the manufacturing cost and time, but also cannot provide a stable voltage by cutting off the voltage, so that the fan motor may still be damaged.

In addition, in the above-mentioned known fan control systems, if the function of detecting the rotating speed and alarming is added to alarm or interrupt the operation of the fan when the rotating speed is too high, additional circuit components must be added, which increases the manufacturing cost and makes the fan control system more complicated. The volume of the circuit is further increased, causing inconvenience.

In view of this, the object of the present invention is to provide a fan control system using a micro-processing unit, which can be applied to a fan motor, so as to solve various problems of the conventional fan control system mentioned above.

Contents of the invention

According to the first idea of the present invention, the fan speed control device is built in a fan, which includes a programmable micro-processing unit for receiving an input signal, determining an output signal according to the input signal, and outputting the output signal signal output; and a fan drive unit, used to receive the output signal, and determine the speed of the fan motor according to the output signal to drive the fan motor, wherein the speed and the input signal are multi-stage functional relationship.

Wherein, the input signal is a variable voltage signal, operating temperature, ambient temperature, duty cycle or frequency of a square wave signal, an external pulse width modulation signal or a speed signal obtained by detecting the actual speed of the fan.

In addition, the micro-processing unit further receives another input signal to control the rotation speed of the fan. The other input signal is a variable voltage signal, operating temperature, ambient temperature, duty cycle or frequency of a square wave signal, an external PWM signal or a rotational speed signal obtained by detecting the actual rotational speed of the fan.

Wherein, the output signal is a pulse width modulation signal.

The fan speed control device also includes a magnetic sensing component or a Hall component for detecting the phase change of the motor driving the fan, so as to output the input signal to the micro-processing unit.

Preferably, when the micro-processing unit judges that the rotational speed is different from a default value stored in the program of the micro-processing unit, it outputs an alarm signal.

Preferably, when the rotational speed is less than a predetermined rotational speed, the rotational speed has a first functional relationship with the input signal, and when the rotational speed is greater than the predetermined rotational speed, the rotational speed has a second functional relationship with the input signal.

Wherein, the first function and the second function may be different linear mathematical functions. For example, the slope of the second function is greater than the slope of the first function.

Or, the relationship between the first function and the second function is a discontinuous or discrete mathematical function.

Alternatively, the rotational speed and the input signal are in a multi-segment curve function relationship.

Alternatively, the rotational speed and the input signal are in multiple stages of different linear functional relationships.

Alternatively, the rotational speed is proportional to the input signal.

According to the second idea of the present invention, the fan speed control device is built in a fan, which includes a micro-processing unit for driving the fan, used to receive an input signal, determine an output signal according to the input signal, and determine an output signal according to the output signal. The signal adjusts the rotational speed of the fan, wherein the rotational speed and the input signal are in a multi-stage functional relationship.

According to the third idea of the present invention, the fan speed control device includes a micro-processing unit for driving the fan, used to receive an input signal, determine an output signal according to the input signal, and adjust the fan speed according to the output signal, wherein the The rotational speed is a curve function relationship with this input signal.

According to the fourth idea of the present invention, the fan speed control device includes a micro-processing unit for driving the fan, used to receive an input signal, determine an output signal according to the input signal, and adjust the fan speed according to the output signal, wherein the The relationship between the speed and the input signal is a discontinuous mathematical function.

According to the fifth idea of the present invention, the fan speed control device includes a micro-processing unit for driving the fan, used to receive a first input signal and a second input signal, and determine an output signal according to the first and second input signals , and adjust the fan speed according to the output signal. Wherein, the first and second input signals are respectively a variable voltage signal, operating temperature, ambient temperature, duty cycle or frequency of a square wave signal, an external pulse width modulation signal or a rotational speed signal obtained by detecting the actual rotational speed of the fan.

Preferably, the rotational speed and the first and second input signals are in a multi-segment mathematical function relationship.

Or, the functional relationship between the rotational speed and the first input signal changes in equal proportion with the change of the second input signal, or the rotational speed and the combination of the first input signal and the second input signal have a polynomial functional relationship .

According to the sixth idea of the present invention, the fan speed control device includes a programmable micro-processing unit for receiving an input signal, determining an output signal according to the input signal, and outputting the output signal; and a fan drive unit , used to receive the output signal, and determine the rotation speed of the fan motor according to the output signal to drive the fan motor, wherein the rotation speed and the input signal are in a curve function relationship.

According to the seventh idea of the present invention, the fan speed control device includes a programmable micro-processing unit for receiving an input signal, determining an output signal according to the input signal, and outputting the output signal; and a fan drive unit , used to receive the output signal, and determine the rotation speed of the fan motor according to the output signal to drive the fan motor, wherein the rotation speed and the input signal are in a discontinuous mathematical function relationship.

According to the eighth idea of the present invention, the fan speed control device includes a programmable micro-processing unit for receiving a first input signal and a second input signal, and determining an output signal according to the first and second input signals ; and a fan drive unit for receiving the output signal and adjusting the speed of the fan motor according to the output signal.

The present invention can be understood more deeply through the detailed description of the following drawings and embodiments.

Description of drawings

Fig. 1a is a schematic diagram showing the conventional fan speed control system controlled by an external variable DC voltage signal.

FIG. 1 b is a schematic diagram showing a variable voltage signal control of a thermistor in a conventional fan speed control system.

Fig. 1c is a schematic diagram showing the conventional fan speed control system controlled by an external pulse modulation signal.

FIG. 2a is a schematic diagram showing a fan motor driven by a fan driving IC in a conventional fan speed control system.

FIG. 2 b is a schematic diagram showing a fan motor driven by a Hall element circuit in a conventional fan speed control system.

FIG. 3 is a diagram showing the relationship between the rotational speed and the operating voltage in the known fan rotational speed control system.

FIG. 4 is a schematic diagram showing a fan rotation speed control device according to a first embodiment of the present invention.

FIG. 5a is a schematic diagram showing a fan speed control device according to a second embodiment of the present invention.

Fig. 5b is a schematic diagram showing a fan speed control device according to a third embodiment of the present invention.

FIG. 5c is a schematic diagram showing a fan speed control device according to a fourth embodiment of the present invention.

FIG. 6 is a schematic diagram showing a fan rotation speed control device according to a fifth embodiment of the present invention.

FIG. 7 is a schematic diagram showing a fan rotation speed control device according to a sixth embodiment of the present invention.

Fig. 8 is a flowchart showing the speed determination by the micro-processing unit of the present invention.

FIG. 9 is a graph showing the relationship between the rotational speed and the operating voltage in the first fan rotational speed control method using a micro-processing unit according to the present invention.

FIG. 10 is a diagram showing the relationship between the rotational speed and the operating voltage in the second fan rotational speed control method using a micro-processing unit according to the present invention.

FIG. 11 is a diagram showing the relationship between the rotational speed and the temperature in the third fan rotational speed control method using a micro-processing unit according to the present invention.

FIG. 12 is a diagram showing the relationship between the rotational speed and the frequency of the input signal in the fourth fan rotational speed control method using a micro-processing unit according to the present invention.

Fig. 13 is a diagram showing the relationship between the rotational speed, temperature and pulse modulation signal in the fifth fan rotational speed control method using a micro-processing unit according to the present invention.

Explanation of main component symbols

100～Fan 110～Fan drive circuit

120～Microprocessing unit 140～Thermistor (NTC)

150～resistor 160～Hall component

170～motor coil 190～switch

500～Fan 510～Fan drive circuit

520～Comparator 530～Thermistor (NTC)

540, 542, 544, 546～resistor 550～inductance

560～Hall components 570～Motor coil

590～switch PWM～pulse modulation signal

Vcc～operating voltage Wmax～maximum speed value

Wo～the first rotational speed value Vmax～the first maximum voltage value

Vmax’～second maximum voltage value Vo～input voltage

Detailed ways

The fan speed control device of the present invention uses a micro-processing unit (Micro controller) to replace each circuit assembly in the known technology; because the micro-processing unit has a programmable characteristic, it is easy to modify its function, and the volume is small, and it has an acceptable The function of converting the digital/analog (A/D) signal can therefore achieve the purpose of solving various problems of the known technology. Each embodiment of the fan speed control device of the present invention will be described respectively below.

Please refer to FIG. 4 , which illustrates a fan speed control device according to an embodiment of the present invention. In the present invention, the same part as the known device is that the fan 100 also receives an operating voltage Vcc and the fan motor is driven by a fan driving unit, such as the fan driving circuit 110 in FIG. 4 . The part different from the prior art adopts a micro-processing unit 120 in the present invention to replace each circuit component in the prior art. The micro-processing unit 120 is programmable and built in the fan, and the program corresponding to the conversion function of the circuit components can be stored inside. Generally speaking, only a voltage (not shown) is provided to the micro-processing unit 120 to operate. Meanwhile, the micro-processing unit 120 is used for receiving an input signal. This input signal can be in various forms, such as voltage, PWM signal, or rotational speed signal, etc., and there are different program designs according to different functional requirements.

As shown in FIG. 4, after receiving the input signal, the microprocessing unit 120 determines an output signal according to the input signal, such as a pulse modulation signal, and outputs the PWM signal to the fan driving circuit 110 through the switch 190, so that the fan driving circuit 110 can determine the rotation speed of the fan motor according to the PWM signal, so as to drive the coil magnetic field of the fan motor to control the rotation speed.

In the above embodiments, the input signal can have various changes according to different functional requirements. For example, referring to the circuits used in Fig. 1a, Fig. 1b and Fig. 1c in the known technology, and using the micro-processing unit technology of the present invention, three embodiments as Fig. 5a, Fig. 5b and Fig. 5c can be obtained, respectively as follows illustrate.

The embodiment of FIG. 5 a is compared to FIG. 1 a, in which the fan 100 also receives an operating voltage Vcc, but this embodiment uses the micro-processing unit 120 instead of the comparator 520 in the prior art to generate the PWM signal. As shown in Figure 5a, the micro-processing unit 120 receives an external variable 0-5V DC voltage signal input, and through the A/D conversion of the micro-processing unit 120 itself, and according to the variable DC voltage, it is directly calculated by the program. The determined PWM signal is output to the fan drive circuit 110 through the switch 190 to determine the speed of the fan motor. In this way, the known triangular wave input device can be omitted, and the program control of the micro-processing unit 120 is more accurate than the known triangular wave comparison result.

Similarly, another embodiment of FIG. 5b is compared with FIG. 1b. The fan 100 receives an operating voltage Vcc, and this embodiment also uses the micro-processing unit 120 instead of the comparator 520 in the prior art to generate the PWM signal. As shown in Figure 5b, the micro-processing unit 120 receives the variable voltage signal input generated by the operating voltage Vcc through the voltage-dividing operation of a thermistor 140 and a fixed resistor 150, and through the A/D of the micro-processing unit 120 itself According to the variable voltage, the generated PWM signal is directly calculated by the program and output to the fan driving circuit 110 through the switch 190 to determine the speed of the fan motor.

In addition, when the present invention controls the fan speed, the input signal may not be in the form of a voltage signal, but as shown in another embodiment of Figure 5c, compared with Figure 1c of the known technology, this embodiment also uses an external PWM signal input to control fan 100. In FIG. 5c, the fan 100 also receives an operating voltage Vcc; however, the external PWM signal is input through the micro-processing unit 120, and through a conversion process such as modulation, it is converted into an internal PWM signal, which is output to the fan drive circuit 110 through the switch 190. Determines the speed of the fan motor. In this way, the program control of the micro-processing unit 120 is more accurate than the conversion results of known components such as resistors.

In addition, compared to Fig. 2a and Fig. 2b in the known technology, which uses fan motor rotor position control and other methods to achieve operations such as slow start (soft start) or special speed change and detection, the present invention can also use micro The processing unit directly replaces the known fan drive circuit. For example, FIG. 6 is a schematic diagram showing a fan speed control device according to another embodiment of the present invention. Wherein, the fan 100 also receives an operating voltage Vcc; however, the present embodiment adopts a fan driving micro-processing unit 120 to replace the known fan driving IC (fan driving circuit) 510, and controls the coil 170 of the fan motor, and cooperates with the magnetic field induction component , such as the Hall component 160, to control the position of the fan motor rotor to output an input signal to the micro-processing unit 120 for slow start (soft start) or special speed change and detection operations. In this way, the microprocessing unit 120 used in this embodiment can have the function of a fan drive unit, and can also receive other external signals, such as variable voltages, external PWM signals, etc. The number of components of the fan speed control device allows a micro-processing unit 120 with multiple programs to perform most of the control operations.

In addition, the micro-processing unit used in the present invention can be used to detect the rotation speed of the fan motor, and the feedback control method is used to make the rotation speed more stable. As shown in FIG. 7, in another embodiment of the present invention, the input signal received by the micro-processing unit 120 may be a speed signal corresponding to the speed of the fan motor, and after calculation and comparison of the speed signal, it is determined to output to the fan. PWM signal for driving circuit 110 . In addition, a default value (ie, the aforementioned second rotational speed value) can also be set in the program of the micro-processing unit 120 , and when the actual rotational speed is not equal to the default value, an alarm signal is sent to prevent the fan rotational speed from being too high or too low.

In the above-mentioned embodiment, the detection and control of the rotational speed can be shown in the flowchart of FIG. 8 . First, the microprocessing unit 120 detects the actual rotational speed of the fan motor (step S10); at this time, after receiving the rotational speed signal, the microprocessing unit 120 determines whether the rotational speed has converged to a predetermined rotational speed determined corresponding to the input signal (step S20). If the rotating speed does not converge, then judge whether the rotating speed is at the minimum rotating speed or the maximum rotating speed (step S30); S40); if it is not at the maximum or minimum rotational speed, adjust the rotational speed (step S50). Such repeated adjustment operations are highly accurate due to the programmable control of the micro-processing unit, and the response time and stability are both improved compared with the known technology.

In addition, in the fan speed control devices of the above embodiments, the fan motor has a maximum speed value, in other words, the fan motor can normally operate at a speed not greater than a maximum speed value. At this time, compared with the corresponding functional relationship F between the rotational speed and the input voltage of the known fan rotational speed control device as shown in FIG. 3 , the present invention can adopt an embodiment as shown in FIG. Make the micro-processing unit 120 when the rotation speed is less than the first rotation speed value Wo, the relationship between the rotation speed and the input voltage is a relationship of a first function F1; and when the rotation speed is greater than the first rotation speed value Wo, the rotation speed and the input voltage are a relationship of a second function F2 relation. In FIG. 9 , both the first function F1 and the second function F2 are linear functions; however, the relationship between the rotational speed and the input voltage does not necessarily need to be a linear function. The present invention can increase the maximum value of the fan motor withstand voltage, and the first maximum voltage value Vmax corresponding to the first function F1 to obtain the maximum rotational speed value Wmax is smaller than the second maximum voltage value corresponding to the second function F2 to obtain the maximum rotational speed value Wmax Value Vmax'. In other words, this embodiment converts the characteristics of the original first function F1 into the second function F2 by program on the rotational speed Wo of point A, and obtains a new rotational speed judging rule to determine the rotational speed feedback control. The rotational speed value is updated, and the slope of the second function F2 corresponding to the input voltage is smaller than the slope of the first function F1 corresponding to the input voltage. In this way, at the maximum rotational speed value Wmax, the corresponding point moves from the original point B to point C, so that the maximum input voltage can be increased, for example, from the commonly known 60V to 80V, or even above 90V.

In addition to the aforementioned fan speed control method in which the slope of the second function F2 is smaller than the slope of the first function F1, the micro-processing unit of the present invention can also be applied to other fan speed control methods. For example, as shown in FIG. 10 , the relationship between the rotational speed W and the input signal or voltage is a multi-segment linear mathematical function, wherein the slope of the first function F1 is smaller than the slope of the second function F2. Alternatively, the relationship between the rotational speed W and the input signal or voltage is a multi-segment but discontinuous or discrete mathematical function, as shown in Figure 11, where the switching point of the discontinuous rotational speed can be different due to the change direction of the input signal (such as rising or falling), A buffer zone is thus formed. For example, when the temperature rises above the first temperature T0, the rotation speed will be quickly converted from W0 to W1. However, when the temperature drops to T0' which is lower than the first temperature T0, the rotation speed will return to the original rotation speed W0, other temperature changes are controlled, and so on.

In addition, in addition to the above-mentioned multi-segment linear mathematical function relationship between the rotation speed W and the input signal, the micro-processing unit can also be used to change the nonlinear mathematical function relationship. As shown in Figure 12, the relationship between the rotation speed W and the input signal is a multi-section curve mathematical function. The micro-processing unit in this paper controls the fan speed according to the frequency (F) of the input signal according to the function operation or table look-up. Therefore, the relationship between the rotational speed and the frequency of the input signal can be changed from one curve function f1 to another curve function f2.

Finally, please refer to FIG. 13 , which is a fifth embodiment of the fan speed control method using a micro-processing unit according to the present invention. This figure can show that the fan speed can be controlled by two or more input signals at the same time, for example, the first input signal is the operating temperature, and the second input signal is a pulse modulation signal. The change of speed and temperature is proportional to the change of the duty cycle of the pulse modulation signal. When the duty cycle is 0%, the fan motor speed is maintained at a fixed speed W0. When the duty cycle is 50%, the fan motor The rotational speed becomes another fixed rotational speed W1. However, when the temperature is higher than T1, the fan speed will gradually increase until the temperature rises to T2. When the temperature is higher than T2, the fan speed will be maintained at another fixed speed W1'. In addition, the combination of the rotation speed and the first input signal and the second input signal may also be in a multimodal function relationship.

Of course, the abscissa in FIGS. 9 to 13 may represent the input voltage, the duty cycle or frequency of the square wave signal, the operating temperature or the ambient temperature, etc., but they are not limited thereto. The fan speed control methods shown in FIGS. 9 to 13 can be applied to all embodiments of the fan speed control device shown in FIGS. 4 to 7 of the present invention.

It should be noted that because the micro-processing unit 120 of the present invention is built into the fan motor and is programmable, and allows more than one program to be stored in it, the fan speed control using the micro-processing unit of the present invention device, the above speed judgment rule or functional relationship can be applied to any of the above embodiments of the present invention at the same time, which can provide and increase the flexibility and multiple options of the fan speed control device without requiring additional or complicated circuits components. In addition, the drawings and embodiments provided by the present invention are not intended to limit the present invention, and are specifically described here.

Therefore, the present application can be modified by those skilled in the art without departing from the scope of protection defined in the claims.

Claims (27)

1. a fan rotation speed control apparatus is built in the fan, and it comprises:

One programmable microprocessing unit in order to receive an input signal, determines an output signal according to this input signal, and with this output signal output; And

One fans drive unit in order to receiving this output signal, and determines the rotating speed of this fan motor according to this output signal, and to drive this fan motor, wherein this rotating speed and this input signal are the multistage function relation.

2. fan rotation speed control apparatus as claimed in claim 1, wherein this microprocessing unit more receives another input signal with the control rotation speed of the fan.

3. fan rotation speed control apparatus as claimed in claim 1 or 2, wherein this input signal and this another input signal are respectively the operation cycle of a variable voltage signal, operating temperature, ambient temperature, square signal or the tach signal of frequency, outside pulse-width signal or detection fan actual speed gained.

4. fan rotation speed control apparatus as claimed in claim 1, wherein this output signal is a pulse-width signal.

5. fan rotation speed control apparatus as claimed in claim 1, it also comprises sense magnetic assembly or a Hall subassembly, in order to the phase change of the motor that detects drive fan, to export this input signal to this microprocessing unit.

6. fan rotation speed control apparatus as claimed in claim 1, wherein this microprocessing unit is exported an alarm signal when judging that this rotating speed is different from a default value in the program that is stored in this microprocessing unit earlier.

7. fan rotation speed control apparatus as claimed in claim 1, wherein when this rotating speed during less than desired speed, this rotating speed and this input signal are one first function relation, and when this rotating speed during greater than this desired speed, this rotating speed and this input signal are one second function relation.

8. fan rotation speed control apparatus as claimed in claim 7, wherein this first function is different line grating mathematic(al) functions with this second function.

9. fan rotation speed control apparatus as claimed in claim 8, wherein the slope of this second function is greater than the slope of this first function.

10. fan rotation speed control apparatus as claimed in claim 7, wherein this first function and this second function are discontinuous or discrete mathematical function relationship.

11. fan rotation speed control apparatus as claimed in claim 1, wherein this rotating speed and this input signal are for multistage curvilinear function relation, the different linear functional relations of multistage or be the equal proportion variation relation.

12. a fan rotation speed control apparatus is built in the fan, it comprises:

The microprocessing unit of one drive fan in order to receive an input signal, determines an output signal according to this input signal, and complies with the rotating speed that this output signal is adjusted fan, and wherein this rotating speed and this input signal are the multistage function relation.

13. fan rotation speed control apparatus as claimed in claim 12, wherein this microprocessing unit more receives another input signal with the control rotation speed of the fan.

14. as claim 12 or 13 described fan rotation speed control apparatus, wherein this input signal and this another input signal are respectively operation cycle or the frequency or the tach signal of outside pulse-width signal or detection fan actual speed gained of a variable voltage signal, operating temperature, ambient temperature, square signal.

15. fan rotation speed control apparatus as claimed in claim 12, wherein this output signal is a pulse-width signal.

16. fan rotation speed control apparatus as claimed in claim 12, it also comprises sense magnetic assembly or a Hall subassembly, in order to the phase change of the motor that detects drive fan, to export this input signal to this microprocessing unit.

17. fan rotation speed control apparatus as claimed in claim 12, wherein this microprocessing unit is exported an alarm signal when judging that this rotating speed is different from a default value in the program that is stored in this microprocessing unit earlier.

18. fan rotation speed control apparatus as claimed in claim 12, wherein when this rotating speed during less than desired speed, this rotating speed and this input signal are one first function relation, and when this rotating speed during greater than this desired speed, this rotating speed and this input signal are one second function relation.

19. fan rotation speed control apparatus as claimed in claim 18, wherein this first function is different line grating mathematic(al) functions with this second function or is discontinuous or discrete mathematical function relationship.

20. fan rotation speed control apparatus as claimed in claim 18, wherein the slope of this second function is greater than the slope of this first function.

21. fan rotation speed control apparatus as claimed in claim 12, wherein this rotating speed and this input signal are for multistage curvilinear function relation, the different linear functional relations of multistage or be the equal proportion variation relation.

22. a fan rotation speed control apparatus, it comprises:

The microprocessing unit of one drive fan in order to receive one first input signal and one second input signal, determines an output signal according to this first and second input signal, and adjusts the rotating speed of fan according to this output signal.

23. a fan rotation speed control apparatus, it comprises:

One programmable microprocessing unit in order to receive one first input signal and one second input signal, determines an output signal according to this first and second input signal; And

The rotating speed of this fan motor in order to receiving this output signal, and is adjusted in one fans drive unit according to this output signal.

24. as claim 22 or 23 described fan rotation speed control apparatus, wherein this first and second input signal is respectively the operation cycle of a variable voltage signal, operating temperature, ambient temperature, square signal or the tach signal of frequency, outside pulse-width signal or detection fan actual speed gained.

25. as claim 22 or 23 described fan rotation speed control apparatus, wherein this rotating speed and this first and second input signal are the multistage mathematical function relationship.

26. as claim 22 or 23 described fan rotation speed control apparatus, wherein the functional relationships of this rotating speed and this first input signal is along with the equal proportion that is varied to of this second input signal changes.

27. as claim 22 or 23 described fan rotation speed control apparatus, wherein this rotating speed is many formulas function relation with this first input signal and combining of this second input signal.

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